Engine Coolant Temperature (ECT) Sensor

Sensor uses a 5-volt reference voltage during engine operation. To check ECT signal voltage, backprobe between signal terminal and ground with engine running. To check sensor resistance, disconnected sensor and measure resistance between sensor terminals. For specifications, see ECT SENSOR SPECIFICATIONS table. For additional testing information, see CIRCUIT TEST DA in TESTS W/CODES - EEC-V article.

ECT SENSOR SPECIFICATIONS ⁽¹⁾

Temperature °F (°C)

Volts ⁽²⁾

⁽³⁾ Resistance Ohms

50 (10)

3.51

58,750

68 (20)

3.07

37,300

86 (30)

2.60

24,270

104 (40)

2.13

16,150

122 (50)

1.70

10,970

140 (60)

1.33

7600

158 (70)

1.02

5370

176 (80)

0.78

3840

194 (90)

0.60

2800

212 (100)

0.46

2070

230 (110)

0.35

1550

⁽¹⁾	Values may differ by as much as 15 percent.

⁽²⁾	Backprobe between signal terminal and ground with engine running.

⁽³⁾	Measure resistance between sensor terminals.